1Following are change highlights associated with official releases. Important 2bug fixes are all mentioned, but internal enhancements are omitted here for 3brevity (even though they are more fun to write about). Much more detail can be 4found in the git revision history: 5 6 http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git 7 git://canonware.com/jemalloc.git 8 9* 3.4.0 (June 2, 2013) 10 11 This version is essentially a small bugfix release, but the addition of 12 aarch64 support requires that the minor version be incremented. 13 14 Bug fixes: 15 - Fix race-triggered deadlocks in chunk_record(). These deadlocks were 16 typically triggered by multiple threads concurrently deallocating huge 17 objects. 18 19 New features: 20 - Add support for the aarch64 architecture. 21 22* 3.3.1 (March 6, 2013) 23 24 This version fixes bugs that are typically encountered only when utilizing 25 custom run-time options. 26 27 Bug fixes: 28 - Fix a locking order bug that could cause deadlock during fork if heap 29 profiling were enabled. 30 - Fix a chunk recycling bug that could cause the allocator to lose track of 31 whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause 32 corruption if allocating via sbrk(2) (unlikely unless running with the 33 "dss:primary" option specified). This was completely harmless on Linux 34 unless using mlockall(2) (and unlikely even then, unless the 35 --disable-munmap configure option or the "dss:primary" option was 36 specified). This regression was introduced in 3.1.0 by the 37 mlockall(2)/madvise(2) interaction fix. 38 - Fix TLS-related memory corruption that could occur during thread exit if the 39 thread never allocated memory. Only the quarantine and prof facilities were 40 susceptible. 41 - Fix two quarantine bugs: 42 + Internal reallocation of the quarantined object array leaked the old 43 array. 44 + Reallocation failure for internal reallocation of the quarantined object 45 array (very unlikely) resulted in memory corruption. 46 - Fix Valgrind integration to annotate all internally allocated memory in a 47 way that keeps Valgrind happy about internal data structure access. 48 - Fix building for s390 systems. 49 50* 3.3.0 (January 23, 2013) 51 52 This version includes a few minor performance improvements in addition to the 53 listed new features and bug fixes. 54 55 New features: 56 - Add clipping support to lg_chunk option processing. 57 - Add the --enable-ivsalloc option. 58 - Add the --without-export option. 59 - Add the --disable-zone-allocator option. 60 61 Bug fixes: 62 - Fix "arenas.extend" mallctl to output the number of arenas. 63 - Fix chunk_recycyle() to unconditionally inform Valgrind that returned memory 64 is undefined. 65 - Fix build break on FreeBSD related to alloca.h. 66 67* 3.2.0 (November 9, 2012) 68 69 In addition to a couple of bug fixes, this version modifies page run 70 allocation and dirty page purging algorithms in order to better control 71 page-level virtual memory fragmentation. 72 73 Incompatible changes: 74 - Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1). 75 76 Bug fixes: 77 - Fix dss/mmap allocation precedence code to use recyclable mmap memory only 78 after primary dss allocation fails. 79 - Fix deadlock in the "arenas.purge" mallctl. This regression was introduced 80 in 3.1.0 by the addition of the "arena.<i>.purge" mallctl. 81 82* 3.1.0 (October 16, 2012) 83 84 New features: 85 - Auto-detect whether running inside Valgrind, thus removing the need to 86 manually specify MALLOC_CONF=valgrind:true. 87 - Add the "arenas.extend" mallctl, which allows applications to create 88 manually managed arenas. 89 - Add the ALLOCM_ARENA() flag for {,r,d}allocm(). 90 - Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls, 91 which provide control over dss/mmap precedence. 92 - Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge". 93 - Define LG_QUANTUM for hppa. 94 95 Incompatible changes: 96 - Disable tcache by default if running inside Valgrind, in order to avoid 97 making unallocated objects appear reachable to Valgrind. 98 - Drop const from malloc_usable_size() argument on Linux. 99 100 Bug fixes: 101 - Fix heap profiling crash if sampled object is freed via realloc(p, 0). 102 - Remove const from __*_hook variable declarations, so that glibc can modify 103 them during process forking. 104 - Fix mlockall(2)/madvise(2) interaction. 105 - Fix fork(2)-related deadlocks. 106 - Fix error return value for "thread.tcache.enabled" mallctl. 107 108* 3.0.0 (May 11, 2012) 109 110 Although this version adds some major new features, the primary focus is on 111 internal code cleanup that facilitates maintainability and portability, most 112 of which is not reflected in the ChangeLog. This is the first release to 113 incorporate substantial contributions from numerous other developers, and the 114 result is a more broadly useful allocator (see the git revision history for 115 contribution details). Note that the license has been unified, thanks to 116 Facebook granting a license under the same terms as the other copyright 117 holders (see COPYING). 118 119 New features: 120 - Implement Valgrind support, redzones, and quarantine. 121 - Add support for additional platforms: 122 + FreeBSD 123 + Mac OS X Lion 124 + MinGW 125 + Windows (no support yet for replacing the system malloc) 126 - Add support for additional architectures: 127 + MIPS 128 + SH4 129 + Tilera 130 - Add support for cross compiling. 131 - Add nallocm(), which rounds a request size up to the nearest size class 132 without actually allocating. 133 - Implement aligned_alloc() (blame C11). 134 - Add the "thread.tcache.enabled" mallctl. 135 - Add the "opt.prof_final" mallctl. 136 - Update pprof (from gperftools 2.0). 137 - Add the --with-mangling option. 138 - Add the --disable-experimental option. 139 - Add the --disable-munmap option, and make it the default on Linux. 140 - Add the --enable-mremap option, which disables use of mremap(2) by default. 141 142 Incompatible changes: 143 - Enable stats by default. 144 - Enable fill by default. 145 - Disable lazy locking by default. 146 - Rename the "tcache.flush" mallctl to "thread.tcache.flush". 147 - Rename the "arenas.pagesize" mallctl to "arenas.page". 148 - Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB). 149 - Change the "opt.prof_accum" default from true to false. 150 151 Removed features: 152 - Remove the swap feature, including the "config.swap", "swap.avail", 153 "swap.prezeroed", "swap.nfds", and "swap.fds" mallctls. 154 - Remove highruns statistics, including the 155 "stats.arenas.<i>.bins.<j>.highruns" and 156 "stats.arenas.<i>.lruns.<j>.highruns" mallctls. 157 - As part of small size class refactoring, remove the "opt.lg_[qc]space_max", 158 "arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and 159 "arenas.[tqcs]bins" mallctls. 160 - Remove the "arenas.chunksize" mallctl. 161 - Remove the "opt.lg_prof_tcmax" option. 162 - Remove the "opt.lg_prof_bt_max" option. 163 - Remove the "opt.lg_tcache_gc_sweep" option. 164 - Remove the --disable-tiny option, including the "config.tiny" mallctl. 165 - Remove the --enable-dynamic-page-shift configure option. 166 - Remove the --enable-sysv configure option. 167 168 Bug fixes: 169 - Fix a statistics-related bug in the "thread.arena" mallctl that could cause 170 invalid statistics and crashes. 171 - Work around TLS deallocation via free() on Linux. This bug could cause 172 write-after-free memory corruption. 173 - Fix a potential deadlock that could occur during interval- and 174 growth-triggered heap profile dumps. 175 - Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags. 176 - Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could 177 cause memory corruption and crashes with --enable-dss specified. 178 - Fix fork-related bugs that could cause deadlock in children between fork 179 and exec. 180 - Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter. 181 - Fix realloc(p, 0) to act like free(p). 182 - Do not enforce minimum alignment in memalign(). 183 - Check for NULL pointer in malloc_usable_size(). 184 - Fix an off-by-one heap profile statistics bug that could be observed in 185 interval- and growth-triggered heap profiles. 186 - Fix the "epoch" mallctl to update cached stats even if the passed in epoch 187 is 0. 188 - Fix bin->runcur management to fix a layout policy bug. This bug did not 189 affect correctness. 190 - Fix a bug in choose_arena_hard() that potentially caused more arenas to be 191 initialized than necessary. 192 - Add missing "opt.lg_tcache_max" mallctl implementation. 193 - Use glibc allocator hooks to make mixed allocator usage less likely. 194 - Fix build issues for --disable-tcache. 195 - Don't mangle pthread_create() when --with-private-namespace is specified. 196 197* 2.2.5 (November 14, 2011) 198 199 Bug fixes: 200 - Fix huge_ralloc() race when using mremap(2). This is a serious bug that 201 could cause memory corruption and/or crashes. 202 - Fix huge_ralloc() to maintain chunk statistics. 203 - Fix malloc_stats_print(..., "a") output. 204 205* 2.2.4 (November 5, 2011) 206 207 Bug fixes: 208 - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as 209 well as for --disable-tls builds in earlier releases. 210 - Do not assume a 4 KiB page size in test/rallocm.c. 211 212* 2.2.3 (August 31, 2011) 213 214 This version fixes numerous bugs related to heap profiling. 215 216 Bug fixes: 217 - Fix a prof-related race condition. This bug could cause memory corruption, 218 but only occurred in non-default configurations (prof_accum:false). 219 - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is 220 excluded from backtraces). 221 - Fix a prof-related bug in realloc() (only triggered by OOM errors). 222 - Fix prof-related bugs in allocm() and rallocm(). 223 - Fix prof_tdata_cleanup() for --disable-tls builds. 224 - Fix a relative include path, to fix objdir builds. 225 226* 2.2.2 (July 30, 2011) 227 228 Bug fixes: 229 - Fix a build error for --disable-tcache. 230 - Fix assertions in arena_purge() (for real this time). 231 - Add the --with-private-namespace option. This is a workaround for symbol 232 conflicts that can inadvertently arise when using static libraries. 233 234* 2.2.1 (March 30, 2011) 235 236 Bug fixes: 237 - Implement atomic operations for x86/x64. This fixes compilation failures 238 for versions of gcc that are still in wide use. 239 - Fix an assertion in arena_purge(). 240 241* 2.2.0 (March 22, 2011) 242 243 This version incorporates several improvements to algorithms and data 244 structures that tend to reduce fragmentation and increase speed. 245 246 New features: 247 - Add the "stats.cactive" mallctl. 248 - Update pprof (from google-perftools 1.7). 249 - Improve backtracing-related configuration logic, and add the 250 --disable-prof-libgcc option. 251 252 Bug fixes: 253 - Change default symbol visibility from "internal", to "hidden", which 254 decreases the overhead of library-internal function calls. 255 - Fix symbol visibility so that it is also set on OS X. 256 - Fix a build dependency regression caused by the introduction of the .pic.o 257 suffix for PIC object files. 258 - Add missing checks for mutex initialization failures. 259 - Don't use libgcc-based backtracing except on x64, where it is known to work. 260 - Fix deadlocks on OS X that were due to memory allocation in 261 pthread_mutex_lock(). 262 - Heap profiling-specific fixes: 263 + Fix memory corruption due to integer overflow in small region index 264 computation, when using a small enough sample interval that profiling 265 context pointers are stored in small run headers. 266 + Fix a bootstrap ordering bug that only occurred with TLS disabled. 267 + Fix a rallocm() rsize bug. 268 + Fix error detection bugs for aligned memory allocation. 269 270* 2.1.3 (March 14, 2011) 271 272 Bug fixes: 273 - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix 274 for OS X in 2.1.2). 275 - Fix a "thread.arena" mallctl bug. 276 - Fix a thread cache stats merging bug. 277 278* 2.1.2 (March 2, 2011) 279 280 Bug fixes: 281 - Fix "thread.{de,}allocatedp" mallctl for OS X. 282 - Add missing jemalloc.a to build system. 283 284* 2.1.1 (January 31, 2011) 285 286 Bug fixes: 287 - Fix aligned huge reallocation (affected allocm()). 288 - Fix the ALLOCM_LG_ALIGN macro definition. 289 - Fix a heap dumping deadlock. 290 - Fix a "thread.arena" mallctl bug. 291 292* 2.1.0 (December 3, 2010) 293 294 This version incorporates some optimizations that can't quite be considered 295 bug fixes. 296 297 New features: 298 - Use Linux's mremap(2) for huge object reallocation when possible. 299 - Avoid locking in mallctl*() when possible. 300 - Add the "thread.[de]allocatedp" mallctl's. 301 - Convert the manual page source from roff to DocBook, and generate both roff 302 and HTML manuals. 303 304 Bug fixes: 305 - Fix a crash due to incorrect bootstrap ordering. This only impacted 306 --enable-debug --enable-dss configurations. 307 - Fix a minor statistics bug for mallctl("swap.avail", ...). 308 309* 2.0.1 (October 29, 2010) 310 311 Bug fixes: 312 - Fix a race condition in heap profiling that could cause undefined behavior 313 if "opt.prof_accum" were disabled. 314 - Add missing mutex unlocks for some OOM error paths in the heap profiling 315 code. 316 - Fix a compilation error for non-C99 builds. 317 318* 2.0.0 (October 24, 2010) 319 320 This version focuses on the experimental *allocm() API, and on improved 321 run-time configuration/introspection. Nonetheless, numerous performance 322 improvements are also included. 323 324 New features: 325 - Implement the experimental {,r,s,d}allocm() API, which provides a superset 326 of the functionality available via malloc(), calloc(), posix_memalign(), 327 realloc(), malloc_usable_size(), and free(). These functions can be used to 328 allocate/reallocate aligned zeroed memory, ask for optional extra memory 329 during reallocation, prevent object movement during reallocation, etc. 330 - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is 331 more human-readable, and more flexible. For example: 332 JEMALLOC_OPTIONS=AJP 333 is now: 334 MALLOC_CONF=abort:true,fill:true,stats_print:true 335 - Port to Apple OS X. Sponsored by Mozilla. 336 - Make it possible for the application to control thread-->arena mappings via 337 the "thread.arena" mallctl. 338 - Add compile-time support for all TLS-related functionality via pthreads TSD. 339 This is mainly of interest for OS X, which does not support TLS, but has a 340 TSD implementation with similar performance. 341 - Override memalign() and valloc() if they are provided by the system. 342 - Add the "arenas.purge" mallctl, which can be used to synchronously purge all 343 dirty unused pages. 344 - Make cumulative heap profiling data optional, so that it is possible to 345 limit the amount of memory consumed by heap profiling data structures. 346 - Add per thread allocation counters that can be accessed via the 347 "thread.allocated" and "thread.deallocated" mallctls. 348 349 Incompatible changes: 350 - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above). 351 - Increase default backtrace depth from 4 to 128 for heap profiling. 352 - Disable interval-based profile dumps by default. 353 354 Bug fixes: 355 - Remove bad assertions in fork handler functions. These assertions could 356 cause aborts for some combinations of configure settings. 357 - Fix strerror_r() usage to deal with non-standard semantics in GNU libc. 358 - Fix leak context reporting. This bug tended to cause the number of contexts 359 to be underreported (though the reported number of objects and bytes were 360 correct). 361 - Fix a realloc() bug for large in-place growing reallocation. This bug could 362 cause memory corruption, but it was hard to trigger. 363 - Fix an allocation bug for small allocations that could be triggered if 364 multiple threads raced to create a new run of backing pages. 365 - Enhance the heap profiler to trigger samples based on usable size, rather 366 than request size. 367 - Fix a heap profiling bug due to sometimes losing track of requested object 368 size for sampled objects. 369 370* 1.0.3 (August 12, 2010) 371 372 Bug fixes: 373 - Fix the libunwind-based implementation of stack backtracing (used for heap 374 profiling). This bug could cause zero-length backtraces to be reported. 375 - Add a missing mutex unlock in library initialization code. If multiple 376 threads raced to initialize malloc, some of them could end up permanently 377 blocked. 378 379* 1.0.2 (May 11, 2010) 380 381 Bug fixes: 382 - Fix junk filling of large objects, which could cause memory corruption. 383 - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual 384 memory limits could cause swap file configuration to fail. Contributed by 385 Jordan DeLong. 386 387* 1.0.1 (April 14, 2010) 388 389 Bug fixes: 390 - Fix compilation when --enable-fill is specified. 391 - Fix threads-related profiling bugs that affected accuracy and caused memory 392 to be leaked during thread exit. 393 - Fix dirty page purging race conditions that could cause crashes. 394 - Fix crash in tcache flushing code during thread destruction. 395 396* 1.0.0 (April 11, 2010) 397 398 This release focuses on speed and run-time introspection. Numerous 399 algorithmic improvements make this release substantially faster than its 400 predecessors. 401 402 New features: 403 - Implement autoconf-based configuration system. 404 - Add mallctl*(), for the purposes of introspection and run-time 405 configuration. 406 - Make it possible for the application to manually flush a thread's cache, via 407 the "tcache.flush" mallctl. 408 - Base maximum dirty page count on proportion of active memory. 409 - Compute various addtional run-time statistics, including per size class 410 statistics for large objects. 411 - Expose malloc_stats_print(), which can be called repeatedly by the 412 application. 413 - Simplify the malloc_message() signature to only take one string argument, 414 and incorporate an opaque data pointer argument for use by the application 415 in combination with malloc_stats_print(). 416 - Add support for allocation backed by one or more swap files, and allow the 417 application to disable over-commit if swap files are in use. 418 - Implement allocation profiling and leak checking. 419 420 Removed features: 421 - Remove the dynamic arena rebalancing code, since thread-specific caching 422 reduces its utility. 423 424 Bug fixes: 425 - Modify chunk allocation to work when address space layout randomization 426 (ASLR) is in use. 427 - Fix thread cleanup bugs related to TLS destruction. 428 - Handle 0-size allocation requests in posix_memalign(). 429 - Fix a chunk leak. The leaked chunks were never touched, so this impacted 430 virtual memory usage, but not physical memory usage. 431 432* linux_2008082[78]a (August 27/28, 2008) 433 434 These snapshot releases are the simple result of incorporating Linux-specific 435 support into the FreeBSD malloc sources. 436 437-------------------------------------------------------------------------------- 438vim:filetype=text:textwidth=80 439